AI Dashboard is available on the Web, Apple, Google, and Microsoft, PRO version
Is it good useful meaningful worthwhile to use register variables in C++?
The register
keyword has been largely ignored by compilers for decades. In C, it prevents you from taking the address of a variable. But otherwise, most compilers ignore the hint it offers.
STANDARD C++ does not support register variables in 2022. In C register variables serve as a hint to the compiler to use a register rather than a memory address. Prior to C++17, it could also be used as a hint to the compiler in C++ as well, but only some conforming compilers did anything as a result. Starting in C++17, register has become an unused but reserved keyword.
Some compilers still permit it and some may even honor the request. Your programs, however, will not be cross-platform or written in true, standards-compliant C++ if you use the register keyword.
NOTE:
The situation in C (as opposed to C++) is quite different.
Get 20% off Google Google Workspace (Google Meet) Standard Plan with the following codes: 96DRHDRA9J7GTN6
Get 20% off Google Workspace (Google Meet) Business Plan (AMERICAS): M9HNXHX3WC9H7YE (Email us for more codes)
Active Anti-Aging Eye Gel, Reduces Dark Circles, Puffy Eyes, Crow's Feet and Fine Lines & Wrinkles, Packed with Hyaluronic Acid & Age Defying Botanicals
“Is it good?”
Usually the answer to that question is that it’s the wrong question, and that you should instead ask “Is it useful/meaningful/worthwhile…?” For example, if you had asked about using the register
keyword in C, I would say “There’s nothing wrong about it. It won’t harm your program. It’s just a waste of time.”
It turns out C++ deprecated the register
keyword in C++11, and removed it in C++17. As of C++17, the keyword register
is now a reserved word with no meaning.
So, the answer to “is it good?” is “No.” Your program will fail to compile as a C++17 program.
By the end of 90s, register
was the “R-type” decal of the C programming world. It did about as much for the speed of your program as the decal did for your car. (Possible exception for weak compilers on some embedded platforms.)
In any case, it doesn’t make sense to have a register
qualifier on a parameter in a function prototype. It is ignored on any function declaration that is not a definition, similar to top level const
.
That is, all four of these are equivalent:
- void foo(int x);
- void foo(const int x);
- void foo(register int x);
- void foo(register const int x);
Now, both of those are meaningful in a definition. The register
keyword stops you from taking an address (in C, but not C++), and const
stops you from mutating the variable.
- void foo(register const int x) {
- const int *px = &x; // ERROR
- x = 42; // ERROR
- }
So, in principle you should be able to delete the unnecessary and useless register keywords from.the prototypes in the header without affecting any aspect of the program’s speed or correctness.
As of C++17 the use of the register
qualifier has been removed. It’s now an unused reserved word.
Old? It is outright obsolete and even if you’re coding on an older version you’re advised to not use it for forward compatibility.
It was a hint to the compiler that a variable would be frequently accessed and the the compiler should prefer to use a CPU register to hold it. The downside being you can’t take the address of a register.
In days of yore (pre-millennium) on now arcane and primitive architectures significant improvements could be had from making (typically) the control variable of a for-loop as a register.
I’m sure that’s still true of some embedded platforms. But modern CPUs have multiple tiers of memory cache and the overhead of loading from and storing variables to main memory is less significant.
We no longer really live with the simplistic Von Neumann of CPU and Main Memory with nothing in between.
Also, optimizers have vastly improved and will tend to make good choices for storage on their own.
It was removed from the standard not because its use was doing harm but that it was regarded as having little practical value and the keyword may be useful in the future.
Reference: here
What are the Greenest or Least Environmentally Friendly Programming Languages?
Machine Learning Engineer Interview Questions and Answers
Active Hydrating Toner, Anti-Aging Replenishing Advanced Face Moisturizer, with Vitamins A, C, E & Natural Botanicals to Promote Skin Balance & Collagen Production, 6.7 Fl Oz
Age Defying 0.3% Retinol Serum, Anti-Aging Dark Spot Remover for Face, Fine Lines & Wrinkle Pore Minimizer, with Vitamin E & Natural Botanicals
Firming Moisturizer, Advanced Hydrating Facial Replenishing Cream, with Hyaluronic Acid, Resveratrol & Natural Botanicals to Restore Skin's Strength, Radiance, and Resilience, 1.75 Oz
Skin Stem Cell Serum
Smartphone 101 - Pick a smartphone for me - android or iOS - Apple iPhone or Samsung Galaxy or Huawei or Xaomi or Google Pixel
Can AI Really Predict Lottery Results? We Asked an Expert.
Djamgatech
Read Photos and PDFs Aloud for me iOS
Read Photos and PDFs Aloud for me android
Read Photos and PDFs Aloud For me Windows 10/11
Read Photos and PDFs Aloud For Amazon
Get 20% off Google Workspace (Google Meet) Business Plan (AMERICAS): M9HNXHX3WC9H7YE (Email us for more)
Get 20% off Google Google Workspace (Google Meet) Standard Plan with the following codes: 96DRHDRA9J7GTN6(Email us for more)
FREE 10000+ Quiz Trivia and and Brain Teasers for All Topics including Cloud Computing, General Knowledge, History, Television, Music, Art, Science, Movies, Films, US History, Soccer Football, World Cup, Data Science, Machine Learning, Geography, etc....
List of Freely available programming books - What is the single most influential book every Programmers should read
- Bjarne Stroustrup - The C++ Programming Language
- Brian W. Kernighan, Rob Pike - The Practice of Programming
- Donald Knuth - The Art of Computer Programming
- Ellen Ullman - Close to the Machine
- Ellis Horowitz - Fundamentals of Computer Algorithms
- Eric Raymond - The Art of Unix Programming
- Gerald M. Weinberg - The Psychology of Computer Programming
- James Gosling - The Java Programming Language
- Joel Spolsky - The Best Software Writing I
- Keith Curtis - After the Software Wars
- Richard M. Stallman - Free Software, Free Society
- Richard P. Gabriel - Patterns of Software
- Richard P. Gabriel - Innovation Happens Elsewhere
- Code Complete (2nd edition) by Steve McConnell
- The Pragmatic Programmer
- Structure and Interpretation of Computer Programs
- The C Programming Language by Kernighan and Ritchie
- Introduction to Algorithms by Cormen, Leiserson, Rivest & Stein
- Design Patterns by the Gang of Four
- Refactoring: Improving the Design of Existing Code
- The Mythical Man Month
- The Art of Computer Programming by Donald Knuth
- Compilers: Principles, Techniques and Tools by Alfred V. Aho, Ravi Sethi and Jeffrey D. Ullman
- Gödel, Escher, Bach by Douglas Hofstadter
- Clean Code: A Handbook of Agile Software Craftsmanship by Robert C. Martin
- Effective C++
- More Effective C++
- CODE by Charles Petzold
- Programming Pearls by Jon Bentley
- Working Effectively with Legacy Code by Michael C. Feathers
- Peopleware by Demarco and Lister
- Coders at Work by Peter Seibel
- Surely You're Joking, Mr. Feynman!
- Effective Java 2nd edition
- Patterns of Enterprise Application Architecture by Martin Fowler
- The Little Schemer
- The Seasoned Schemer
- Why's (Poignant) Guide to Ruby
- The Inmates Are Running The Asylum: Why High Tech Products Drive Us Crazy and How to Restore the Sanity
- The Art of Unix Programming
- Test-Driven Development: By Example by Kent Beck
- Practices of an Agile Developer
- Don't Make Me Think
- Agile Software Development, Principles, Patterns, and Practices by Robert C. Martin
- Domain Driven Designs by Eric Evans
- The Design of Everyday Things by Donald Norman
- Modern C++ Design by Andrei Alexandrescu
- Best Software Writing I by Joel Spolsky
- The Practice of Programming by Kernighan and Pike
- Pragmatic Thinking and Learning: Refactor Your Wetware by Andy Hunt
- Software Estimation: Demystifying the Black Art by Steve McConnel
- The Passionate Programmer (My Job Went To India) by Chad Fowler
- Hackers: Heroes of the Computer Revolution
- Algorithms + Data Structures = Programs
- Writing Solid Code
- JavaScript - The Good Parts
- Getting Real by 37 Signals
- Foundations of Programming by Karl Seguin
- Computer Graphics: Principles and Practice in C (2nd Edition)
- Thinking in Java by Bruce Eckel
- The Elements of Computing Systems
- Refactoring to Patterns by Joshua Kerievsky
- Modern Operating Systems by Andrew S. Tanenbaum
- The Annotated Turing
- Things That Make Us Smart by Donald Norman
- The Timeless Way of Building by Christopher Alexander
- The Deadline: A Novel About Project Management by Tom DeMarco
- The C++ Programming Language (3rd edition) by Stroustrup
- Patterns of Enterprise Application Architecture
- Computer Systems - A Programmer's Perspective
- Agile Principles, Patterns, and Practices in C# by Robert C. Martin
- Growing Object-Oriented Software, Guided by Tests
- Framework Design Guidelines by Brad Abrams
- Object Thinking by Dr. David West
- Advanced Programming in the UNIX Environment by W. Richard Stevens
- Hackers and Painters: Big Ideas from the Computer Age
- The Soul of a New Machine by Tracy Kidder
- CLR via C# by Jeffrey Richter
- The Timeless Way of Building by Christopher Alexander
- Design Patterns in C# by Steve Metsker
- Alice in Wonderland by Lewis Carol
- Zen and the Art of Motorcycle Maintenance by Robert M. Pirsig
- About Face - The Essentials of Interaction Design
- Here Comes Everybody: The Power of Organizing Without Organizations by Clay Shirky
- The Tao of Programming
- Computational Beauty of Nature
- Writing Solid Code by Steve Maguire
- Philip and Alex's Guide to Web Publishing
- Object-Oriented Analysis and Design with Applications by Grady Booch
- Effective Java by Joshua Bloch
- Computability by N. J. Cutland
- Masterminds of Programming
- The Tao Te Ching
- The Productive Programmer
- The Art of Deception by Kevin Mitnick
- The Career Programmer: Guerilla Tactics for an Imperfect World by Christopher Duncan
- Paradigms of Artificial Intelligence Programming: Case studies in Common Lisp
- Masters of Doom
- Pragmatic Unit Testing in C# with NUnit by Andy Hunt and Dave Thomas with Matt Hargett
- How To Solve It by George Polya
- The Alchemist by Paulo Coelho
- Smalltalk-80: The Language and its Implementation
- Writing Secure Code (2nd Edition) by Michael Howard
- Introduction to Functional Programming by Philip Wadler and Richard Bird
- No Bugs! by David Thielen
- Rework by Jason Freid and DHH
- JUnit in Action
#BlackOwned #BlackEntrepreneurs #BlackBuniness #AWSCertified #AWSCloudPractitioner #AWSCertification #AWSCLFC02 #CloudComputing #AWSStudyGuide #AWSTraining #AWSCareer #AWSExamPrep #AWSCommunity #AWSEducation #AWSBasics #AWSCertified #AWSMachineLearning #AWSCertification #AWSSpecialty #MachineLearning #AWSStudyGuide #CloudComputing #DataScience #AWSCertified #AWSSolutionsArchitect #AWSArchitectAssociate #AWSCertification #AWSStudyGuide #CloudComputing #AWSArchitecture #AWSTraining #AWSCareer #AWSExamPrep #AWSCommunity #AWSEducation #AzureFundamentals #AZ900 #MicrosoftAzure #ITCertification #CertificationPrep #StudyMaterials #TechLearning #MicrosoftCertified #AzureCertification #TechBooks
Top 1000 Canada Quiz and trivia: CANADA CITIZENSHIP TEST- HISTORY - GEOGRAPHY - GOVERNMENT- CULTURE - PEOPLE - LANGUAGES - TRAVEL - WILDLIFE - HOCKEY - TOURISM - SCENERIES - ARTS - DATA VISUALIZATION
Top 1000 Africa Quiz and trivia: HISTORY - GEOGRAPHY - WILDLIFE - CULTURE - PEOPLE - LANGUAGES - TRAVEL - TOURISM - SCENERIES - ARTS - DATA VISUALIZATION
Exploring the Pros and Cons of Visiting All Provinces and Territories in Canada.
Exploring the Advantages and Disadvantages of Visiting All 50 States in the USA
Health Health, a science-based community to discuss health news and the coronavirus (COVID-19) pandemic
- Circadian rhythms can influence drugs’ effectivenessby /u/Sariel007 on April 24, 2024 at 10:33 pm
submitted by /u/Sariel007 [link] [comments]
- Does eating too much sugar really make kids hyper? We asked researchers.by /u/newzee1 on April 24, 2024 at 9:45 pm
submitted by /u/newzee1 [link] [comments]
- Why dentists say you shouldn’t rinse after brushingby /u/newzee1 on April 24, 2024 at 9:35 pm
submitted by /u/newzee1 [link] [comments]
- Partnering for a Healthier Detroit: Gilbert Family Foundation & Henry Ford Health's Visionby /u/sbgroup65 on April 24, 2024 at 7:50 pm
submitted by /u/sbgroup65 [link] [comments]
- First patient receives combined pig kidney transplant, heart pumpby /u/VirtualNecromancer on April 24, 2024 at 6:45 pm
submitted by /u/VirtualNecromancer [link] [comments]
Today I Learned (TIL) You learn something new every day; what did you learn today? Submit interesting and specific facts about something that you just found out here.
- TIL that John Rock, one of the creators of the contraceptive pill, was a devout Catholicby /u/trashconverters on April 25, 2024 at 2:46 am
submitted by /u/trashconverters [link] [comments]
- TIL that the Chicago area has more hot dog restaurants than McDonald's, Wendy's, and Burger King restaurants combinedby /u/Brix001 on April 25, 2024 at 1:32 am
submitted by /u/Brix001 [link] [comments]
- TIL of the Glasgow effect, a term which refers to the lower life expectancy of residents of the Scottish city compared to the rest of the UK and Europe. Some hypotheses for this effect include stress, especially in childhood, leading to ill health; violent gang culture; and rate of premature births.by /u/pukkapaddington on April 25, 2024 at 1:32 am
submitted by /u/pukkapaddington [link] [comments]
- TIL of the mummy of Takabuti, a young ancient Egyptian woman who died from an axe blow to her back. A study of the proteins in her leg muscles allowed researchers to hypothesise that she had been running for some time before she was killed.by /u/roughvandyke on April 24, 2024 at 11:55 pm
submitted by /u/roughvandyke [link] [comments]
- TIL that it took Boeing less than 3 years from starting the 747 project to first flight. The first commercial flight occurred 11 months later.by /u/getthedudesdanny on April 24, 2024 at 11:19 pm
submitted by /u/getthedudesdanny [link] [comments]
Reddit Science This community is a place to share and discuss new scientific research. Read about the latest advances in astronomy, biology, medicine, physics, social science, and more. Find and submit new publications and popular science coverage of current research.
- James Webb Space Telescope takes its first images of forming planetary systemsby /u/UVicScience on April 25, 2024 at 1:05 am
submitted by /u/UVicScience [link] [comments]
- Tiny rubber spheres used to make a programmable fluid: “We can [now] make hydraulic actuators soft and self-controlled. The fluid itself is doing all the control for us, so we don’t have to control the robot from the outside”by /u/TurretLauncher on April 25, 2024 at 12:33 am
submitted by /u/TurretLauncher [link] [comments]
- A sweetener used in cakes, soft drinks and chewing gum - neotame (sugar substitute E961), used to replace aspartame - can affect people’s health by weakening the gut wall as it damages intestinal bacteria, which may lead to irritable bowel syndrome or insulin resistance, a new study has found.by /u/mvea on April 24, 2024 at 9:29 pm
submitted by /u/mvea [link] [comments]
- A Florida man with migraines had a CT scan which showed that his brain was infested with tapeworm cysts. A new study hypothesised that he ate undercooked infected pork that contained tapeworm cysts, known as cysticercus, and re-infected himself with eggs passed in his faeces through poor hygiene.by /u/mvea on April 24, 2024 at 9:13 pm
submitted by /u/mvea [link] [comments]
- Early warning sign of extinction. Research found before an extinction pulse 34 million years ago, marine communities became highly specialized everywhere but in the southern high latitudes, implying that these micro-plankton migrated en masse to higher latitudes and away from the tropicsby /u/Wagamaga on April 24, 2024 at 9:04 pm
submitted by /u/Wagamaga [link] [comments]
Reddit Sports Sports News and Highlights from the NFL, NBA, NHL, MLB, MLS, and leagues around the world.
- Heat catch fire from deep, steal Game 2 from Celticsby /u/Oldtimer_2 on April 25, 2024 at 2:54 am
submitted by /u/Oldtimer_2 [link] [comments]
- 'Invest in these women': WNBA champion A'ja Wilson hopes Caitlin Clark's popularity helps the league growby /u/kundu123 on April 25, 2024 at 1:28 am
submitted by /u/kundu123 [link] [comments]
- Tiger Woods, Rory McIlroy to receive massive loyalty payouts from PGA Tour after equity investment, per reportby /u/Oldtimer_2 on April 25, 2024 at 12:50 am
submitted by /u/Oldtimer_2 [link] [comments]
- Hiltzik: The folly of public financing for stadiums - Los Angeles Timesby /u/davster39 on April 24, 2024 at 10:12 pm
submitted by /u/davster39 [link] [comments]
- Chicago Bears give new stadium update, say they will provide over $2B for lakefront domed projectby /u/Oldtimer_2 on April 24, 2024 at 10:02 pm
submitted by /u/Oldtimer_2 [link] [comments]